undef

s1a-ew-grd-vv-20180905t020104-20180905t020208-023557-0290cc-001_filter

s1a-ew-grd-vh-20180905t020104-20180905t020208-023557-0290cc-002_filter

s1a-ew-grd-vv-20180905t020104-20180905t020208-023557-0290cc-001_winddir

s1a-ew-grd-vh-20180905t020104-20180905t020208-023557-0290cc-002_winddir